Aluminum alloy foil for heat exchanger

Abstract

The invention provides an aluminum alloy foil for a heat exchanger, and relates to the technical field of aluminum alloy foils for heat exchangers, the aluminum alloy foil comprises an aluminum alloy foil layer, a heat insulation panel, a heat exchange plate A and a heat exchange plate B. The aluminum alloy foil layer comprises two adjusting protection rings, and a fixed protection ring is arranged between the outer sides of the two adjusting protection rings. The same heat insulation aluminum foil ring B is arranged between the inner sides of the two adjusting protection rings and the fixed protection ring, an adjusting layer is arranged on the outer side surface of the heat insulation aluminum foil ring B, a plurality of prism grooves are machined in the adjusting layer, a limiting ring groove is machined in the outer side surface of one side of each adjusting protection ring, and a positioning ring groove is machined in the inner wall of the bottom of one side of each limiting ring groove. A sealing ring is hooped in the positioning ring groove; according to the technical scheme, the adjusting layer assists the heat insulation aluminum foil ring B to be converted from a flat and relaxed state to a contracted state, the use number of the heat exchange plates A and the heat exchange plates B can be controlled according to requirements, and the heat insulation aluminum foil ring B is kept to stably block heat loss.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy foil for heat exchangers, in particular to an aluminum alloy foil for heat exchangers. Background Art

[0002] A heat exchanger is an energy-saving device that transfers heat between two or more fluids at different temperatures. It transfers heat from a fluid with a higher temperature to a fluid with a lower temperature, so that the fluid temperature reaches the specified index of the process to meet the needs of process conditions. It is also one of the main equipment for improving energy utilization.

[0003] Heat exchangers are often used to heat low-temperature fluids or cool high-temperature fluids, vaporize liquids into steam or condense steam into liquids in industrial production such as petroleum, chemical, light industry, pharmaceutical, and energy. Heat exchangers can be either unit equipment, such as heaters, coolers, and condensers, or they can be components of a process equipment, such as heat exchangers in ammonia synthesis towers.

[0004] As a type of heat exchanger, the brazed plate heat exchanger is a new type of high-efficiency heat exchanger made of a series of corrugated metal sheets stacked and brazed. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates. Compared with conventional shell and tube heat exchangers, its heat transfer coefficient is much higher under the same flow resistance and pump power consumption, and it has a tendency to replace shell and tube heat exchangers within the applicable range.

[0005] The existing brazed plate heat exchanger performs heat exchange of the medium by allowing the medium to pass through the rectangular channels between the plates, but the edges of each plate are sealed by welding. In actual application, each plate is exposed to the outside, which easily increases heat energy loss, thereby reducing the effect of heat exchange between cold and hot media. Summary of the invention

[0006] In order to overcome the problem that the edges of each plate of the existing brazed plate heat exchanger are sealed by welding, in actual application, each plate is exposed to the outside, which is easy to increase heat energy loss, thereby reducing the effect of heat exchange between cold and hot media. An embodiment of the present application provides an aluminum alloy foil for a heat exchanger, by arranging an insulating aluminum foil ring B supported by an adjustment layer on the outside of multiple heat exchange plates A and multiple heat exchange plates B. When the number of heat exchange plates A and heat exchange plates B used is controlled according to demand, the insulating aluminum foil ring B can be assisted by the adjustment layer to transform from a flat and relaxed state to a contracted state, so that the insulating aluminum foil ring B can be kept stable to block heat loss, and the degree of wrinkles on the surface of each area of ​​the insulating aluminum foil ring B can be kept as the same as possible.

[0007] The technical solution adopted by the embodiment of the present application to solve the technical problem is:

[0008] An aluminum alloy foil for a heat exchanger comprises an aluminum alloy foil layer, a heat insulation panel, a heat exchange plate A and a heat exchange plate B. Two heat insulation panels are provided, and two corners of the top and bottom of one side are processed with a medium channel A, and two corners of the top and bottom of the other side are processed with a medium channel B;

[0009] A plurality of heat exchange plates A are provided; and

[0010] There are multiple heat exchange plates B, which are staggered with multiple heat exchange plates A and are arranged in a left-right direction.

[0011] The aluminum alloy foil layer includes two adjustment protection rings, a fixed protection ring is arranged between the outer sides of the two adjustment protection rings, the same insulation aluminum foil ring B is arranged between the inner sides of the two adjustment protection rings and one fixed protection ring, and the outer surface of the insulation aluminum foil ring B is provided with an adjustment layer, and the two insulation panels are symmetrically arranged front to back, and the multiple heat exchange plates A and the multiple heat exchange plates B in staggered combination are stacked and packaged therebetween, and the multiple heat exchange plates A and the multiple heat exchange plates B are connected and fixed by welding, and the insulation aluminum foil ring B is sleeved on the outside of the multiple heat exchange plates A and the multiple heat exchange plates B, and the inner surface is in contact with the surrounding edge surfaces of the multiple heat exchange plates A and the multiple heat exchange plates B.

[0012] In a possible implementation, one side of the two adjustment protection rings is bolted and respectively assembled and fixed to the two insulation panels, supporting and fixing the protection rings to move between the outer sides of the two adjustment protection rings to adapt to the application number of multiple heat exchange plates A and multiple heat exchange plates B.

[0013] In a possible implementation, a plurality of prism grooves are processed inside the adjustment layer, and the cross-sections of the plurality of prism grooves are all regular hexagons, and the openings face perpendicular to the surface of the heat-insulating aluminum foil ring B.

[0014] In a possible implementation, the center of the outer side of the heat-insulating aluminum foil ring B protrudes toward and fills between the two adjustable protective rings, and is fixed to the inner surface of the fixed protective ring.

[0015] In a possible implementation, outer surfaces of both sides of the adjustment layer are provided with heat-insulating aluminum foil rings A, and the outer surfaces of the heat-insulating aluminum foil rings A are in contact with the inner surfaces of the adjustment protection ring.

[0016] In one possible implementation, a limiting ring groove is processed on the outer surface of one side of the adjustable protective ring, and the limiting ring groove is located on the opposite side of the connection point between the adjustable protective ring and the insulation panel. The inner surface of the fixed protective ring fits with the inner wall of the limiting ring groove, so that the adjustable protective ring limits the movable range of the fixed protective ring between the two adjustable protective rings through the two limiting ring grooves.

[0017] In a possible implementation, a positioning ring groove is processed on the bottom inner wall of one side of the limiting ring groove, and a sealing ring is connected to the inner hoop of the positioning ring groove. The sealing ring is located on the side of the adjustment protection ring away from the connection point with the insulation panel, and the fixed protection ring is movably connected to the outer side of the sealing ring.

[0018] In a possible implementation, the sealing ring is made of silicone material and is hollow inside. The sealing ring is filled between the fixed protective ring and the adjustable protective ring, and small holes are punched on the surface of the sealing ring during installation to support air intake and air release inside the sealing ring.

[0019] In a possible implementation, limiting strip grooves are processed on the inner walls on both sides of the limiting ring groove, and limiting parts are arranged inside the front and rear sides of the fixed protective ring. One end of the limiting part passes through the interior of the fixed protective ring and extends into the interior of the limiting strip groove to limit the disconnection of the adjusting protective ring and the fixed protective ring.

[0020] In one possible implementation, the limiting member includes a threaded rod, one end of which is integrally formed with a bolt head, and the other end of which is integrally formed with a round rod. The threaded rod is threadedly connected to the interior of a fixed protective ring so that one side surface of the bolt head is pressed against the outer surface of the fixed protective ring, and one end of the round rod extends into the interior of the limiting strip groove and slides therein.

[0021] The beneficial effects of this application are:

[0022] First, in this solution, by arranging the heat-insulating aluminum foil ring B supported by the adjustment layer outside the plurality of heat exchange plates A and the plurality of heat exchange plates B, when the number of heat exchange plates A and the heat exchange plates B used is controlled according to demand, the heat-insulating aluminum foil ring B can be assisted by the adjustment layer to transform from a flat and relaxed state to a contracted state, so that the heat-insulating aluminum foil ring B can be kept stable to block heat loss, and the degree of wrinkles on the surface of each area of ​​the heat-insulating aluminum foil ring B can be kept as the same as possible;

[0023] Second, in this solution, by setting limit members on both sides of the front and rear of the fixed protective ring, after the limit member is fixed inside the fixed protective ring, one end of the limit member extends into the limit groove processed on the adjustable protective ring. When the fixed protective ring moves between the outsides of the two adjustable protective rings, the limit groove and the limit member can be used to control the range of movement of the fixed protective ring outside the two medium channels A. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of an aluminum alloy foil for a heat exchanger of the present invention in use;

[0025] Figure 2 This is a schematic diagram of an explosion of an aluminum alloy foil for a heat exchanger of the present invention;

[0026] Figure 3 This is one of the cross-sectional views of an aluminum alloy foil layer for an aluminum alloy foil for a heat exchanger of the present invention;

[0027] Figure 4 Aluminum alloy foil for heat exchanger of the present invention Figure 3 The enlarged structural diagram of the middle A part;

[0028] Figure 5 This is a second cross-sectional view of an aluminum alloy foil layer for an aluminum alloy foil for a heat exchanger of the present invention;

[0029] Figure 6 Aluminum alloy foil for heat exchanger of the present invention Figure 5 A schematic diagram of the enlarged structure of the middle B part;

[0030] Figure 7 This is a schematic diagram of the structure of an aluminum alloy foil heat-insulating aluminum foil ring A, a heat-insulating aluminum foil ring B and an adjustment layer for a heat exchanger of the present invention.

[0031] Figure numerals: 1. Medium channel A; 2. Medium channel B; 3. Insulation panel; 4. Aluminum alloy foil layer; 401. Adjustment protection ring; 402. Fixed protection ring; 403. Insulation aluminum foil ring A; 404. Adjustment layer; 405. Insulation aluminum foil ring B; 406. Limiting piece; 4061. Threaded rod; 4062. Bolt head; 4063. Round rod; 407. Sealing ring; 5. Heat exchange plate A; 6. Heat exchange plate B; 7. Limiting ring groove; 8. Limiting strip groove; 9. Positioning ring groove; 10. Prism groove. DETAILED DESCRIPTION

[0032] The technical solution in the embodiment of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows:

[0033] Embodiment 1:

[0034] This embodiment introduces a specific structure of an aluminum alloy foil for a heat exchanger. Figure 1-Figure 7As shown, it includes an aluminum alloy foil layer 4, two heat insulation panels 3 (two corners of the top and bottom of one side are processed with medium channels A1, and two corners of the top and bottom of the other side are processed with medium channels B2), a plurality of heat exchange plates A5 and heat exchange plates B6 which are staggered with the plurality of heat exchange plates A5 and respectively maintained in a left-right opposite arrangement state, the aluminum alloy foil layer 4 includes two adjustment protection rings 401, a fixed protection ring 402 is arranged between the outer sides of the two adjustment protection rings 401, the same heat insulation aluminum foil ring B405 is arranged between the inner sides of the two adjustment protection rings 401 and a fixed protection ring 402, and the outer surface of the heat insulation aluminum foil ring B405 is provided with an adjustment layer 404;

[0035] Among them, based on the common knowledge in the art, two heat insulation panels 3 are symmetrically arranged front and back, and multiple heat exchange plates A5 and multiple heat exchange plates B6 in staggered combination are stacked and packaged between the two, and multiple heat exchange plates A5 and multiple heat exchange plates B6 are connected and fixed by welding. When the cold medium flows through the channels inside the multiple heat exchange plates A5 and the multiple heat exchange plates B6 through the two medium channels B2, and the hot medium flows through the channels inside the multiple heat exchange plates A5 and the multiple heat exchange plates B6 through the two medium channels A1, the cold and hot media can perform heat exchange work;

[0036] At the same time, by sleeve-fitting the heat-insulating aluminum foil ring B405 on the outside of the plurality of heat exchange plates A5 and the plurality of heat exchange plates B6, and the inner surface is in contact with the peripheral edge surfaces of the plurality of heat exchange plates A5 and the plurality of heat exchange plates B6, when the cold and hot media pass through the channels inside the plurality of heat exchange plates A5 and the plurality of heat exchange plates B6, the heat loss can be avoided as much as possible by means of the heat-insulating effect of the heat-insulating aluminum foil ring B405, thereby ensuring the effect of heat exchange;

[0037] Secondly, in order to increase or decrease the heat exchange plates A5 and B6 between the two insulation panels 3 according to the needs, the aluminum alloy foil layer 4 can adapt to the distance between the two insulation panels 3, such as Figure 1 and Figure 2 As shown, by using bolts to assemble and fix one side of two adjustment protection rings 401 to two insulation panels 3 respectively, the two adjustment protection rings 401 are erected between the two insulation panels 3, and are used to support and fix the protection ring 402 to move between the outer sides of the two adjustment protection rings 401, which can adapt to the change in the number of applications of multiple heat exchange plates A5 and multiple heat exchange plates B6, and the insulation aluminum foil ring B405 is on the inner side of the adjustment layer 404. When the distance between the two adjustment protection rings 401 changes from the maximum to the minimum, it can be squeezed from a flat state to a wrinkled state, which does not affect the insulation aluminum foil ring B405 to reduce heat loss outside the multiple heat exchange plates A5 and the multiple heat exchange plates B6;

[0038] Furthermore, in order to make the degree of wrinkles in each area remain basically the same when the heat-insulating aluminum foil ring B405 is compressed and wrinkled in its plane, such as Figure 7 As shown, the adjustment layer 404 is processed with a plurality of prism grooves 10, and the cross-sections of the plurality of prism grooves 10 are all regular hexagons. By making the openings of the plurality of prism grooves 10 face perpendicular to the surface of the heat insulating aluminum foil ring B405, no matter what state the heat insulating aluminum foil ring B405 is in, it can be supported by the adjustment layer 404 except the area processed with the prism grooves 10. And because the prism grooves 10 are processed, when the heat insulating aluminum foil ring B405 is compressed, it is convenient for the adjustment layer 404 to be compressed;

[0039] At the same time, the center of the outer side of the heat-insulating aluminum foil ring B405 protrudes toward between the two adjustment protection rings 401, so that the outer center area of ​​the heat-insulating aluminum foil ring B405 can be filled between the two adjustment protection rings 401 and fit and fix with the inner surface of the fixed protection ring 402;

[0040] In some examples, the outer surfaces of both sides of the adjustment layer 404 are provided with heat-insulating aluminum foil rings A403, and by making the outer surface of the heat-insulating aluminum foil ring A403 fit the inner surface of the adjustment protection ring 401, the heat-insulating aluminum foil ring B405 can be assisted to prevent heat loss between the adjustment protection ring 401, the fixed protection ring 402 and the multiple heat exchange plates A5, and the multiple heat exchange plates B6;

[0041] In one possible implementation, a limiting ring groove 7 is processed on the outer surface of one side of the adjusting protection ring 401, and the limiting ring groove 7 is located on the opposite side of the connection point between the adjusting protection ring 401 and the insulation panel 3. The inner surface of the fixed protection ring 402 fits with the inner wall of the limiting ring groove 7, so that the adjusting protection ring 401 limits the movable range of the fixed protection ring 402 between the two adjusting protection rings 401 through the two limiting ring grooves 7.

[0042] Embodiment 2:

[0043] Based on Example 1, this example introduces the specific structure of the support rod group, such as Figure 1 , Figure 5 and Figure 6 As shown, a positioning ring groove 9 is processed on the inner wall of the bottom of one side of the limiting ring groove 7, and a sealing ring 407 is connected to the inner hoop of the positioning ring groove 9;

[0044] The sealing ring 407 is made of silicone material and is hollow inside. The sealing ring 407 is located on the side of the adjustable protective ring 401 away from the connection point with the heat insulation panel 3, and the fixed protective ring 402 is movably connected to the outside of the sealing ring 407. When the sealing ring 407 is filled between the fixed protective ring 402 and the adjustable protective ring 401, the fixed protective ring 402 is movable outside the two adjustable protective rings 401. The sealing ring 407 can be deformed to adapt to the gap between the fixed protective ring 402 and the adjustable protective ring 401, thereby achieving a nearly sealed effect.

[0045] At the same time, when the sealing ring 407 is installed inside the positioning ring groove 9, a small hole (at any position) needs to be punched inside the sealing ring 407. When the fixed protective ring 402 is installed outside the adjustable protective ring 401, the sealing ring 407 is flattened, and the gas inside the sealing ring 407 can be released to the outside through the small hole. In the process of the sealing ring 407 being flattened or relaxed, it automatically adapts between inhalation and degassing.

[0046] In some examples, the inner walls of both sides of the limiting ring groove 7 are processed with limiting strip grooves 8, and the inner parts of the front and rear sides of the fixed protective ring 402 are provided with limiting members 406, and the limiting members 406 include a threaded rod 4061, one end of the threaded rod 4061 is integrally formed with a bolt head 4062, and the other end of the threaded rod 4061 is integrally formed with a round rod 4063;

[0047] Among them, by making one end of the limiting member 406 pass through the interior of the fixed protective ring 402 and extend into the interior of the limiting strip groove 8, when the fixed protective ring 402 moves outside the two adjustable protective rings 401, one end of the limiting member 406 can cooperate with the limiting strip groove 8 to automatically limit the adjustable protective ring 401 and the fixed protective ring 402 from being disconnected, so as to ensure that the fixed protective ring 402 cooperates with the two adjustable protective rings 401 to cover the four sides of the multiple heat exchange plates A5 and the multiple heat exchange plates B6;

[0048] Secondly, by threading the threaded rod 4061 on the limiting member 406 to the inside of the fixed protective ring 402, one side surface of the bolt head 4062 can be pressed against the outer surface of the fixed protective ring 402. When one end of the round rod 4063 extends into the inside of the limiting strip groove 8, the round rod 4063 can be ensured to be in a fixed state, thereby ensuring the reliability of the limiting member 406 in the fixed protective ring 402 and limiting the fixed protective ring 402 from slipping off the adjusting protective ring 401.

[0049] Specifically, when the aluminum alloy foil for heat exchanger is used in conjunction with the brazed plate heat exchanger to work:

[0050] First, the brazed plate heat exchanger is produced and processed with reference to the known technology in the art, and before the multiple heat exchange plates A5 and the multiple heat exchange plates B6 are connected to the two heat insulation panels 3, the adjustment layer 404 connected and fixed to the heat insulation aluminum foil ring B405 is sleeved on the outside of the multiple heat exchange plates A5 and the multiple heat exchange plates B6, so that the fixed protective ring 402 fixed on the outside of the adjustment layer 404 is set on the outside of the multiple heat exchange plates A5 and the multiple heat exchange plates B6;

[0051] Then, two heat insulation panels 3 are fixed to the front and back sides of the assembly of multiple heat exchange plates A5 and multiple heat exchange plates B6, and two adjustment protection rings 401 are respectively sleeved on the outside of the two heat insulation panels 3, and the adjustment protection ring 401 is sleeved to the inner side of the fixed protection ring 402 by means of the limiting ring groove 7 on the adjustment protection ring 401 (and the positioning ring groove 9 on the inner side of the limiting ring groove 7 is hooped with a sealing ring 407, and the gap between the outer side of the adjustment protection ring 401 and the inner side of the fixing protection ring 402 is filled by means of the sealing ring 407). After the adjusting protection ring 401 is assembled and fixed to the heat insulation panel 3, the fixed protection ring 402 is set between the two adjusting protection rings 401, and the threaded connection between the threaded rod 4061 and the fixed protection ring 402 is adjusted. When the bolt head 4062 is pressed on the surface of the fixed protection ring 402, one end of the round rod 4063 extends into the interior of the limiting strip groove 8. With the cooperation of the limiting strip groove 8 and the round rod 4063, the fixed protection ring 402 can be prevented from detaching from the outside of the two adjusting protection rings 401;

[0052] Next, the cold medium flows through the channels inside the multiple heat exchange plates A5 and the multiple heat exchange plates B6 through the two medium channels B2, and the hot medium flows through the channels inside the multiple heat exchange plates A5 and the multiple heat exchange plates B6 through the two medium channels A1, so that the cold and hot media can perform heat exchange. In this process, the heat insulating aluminum foil ring B405 covers the outer side of the welding points with the multiple heat exchange plates A5 and the multiple heat exchange plates B6 to limit heat loss.

[0053] At the same time, when the number of heat exchange plates A5 and heat exchange plates B6 is adjusted according to the medium conveying demand, the distance between the two heat insulation panels 3 changes adaptively, and the two adjustment protection rings 401 change with the two heat insulation panels 3. The adjustment layer 404 has multiple prism grooves 10 processed inside it. When the supporting heat insulation aluminum foil ring B405 switches from a flat expansion state to a wrinkled contraction state (the heat insulation aluminum foil ring B405 needs to maintain the maximum size before adjustment), it can ensure smooth movement and reduce resistance.

[0054] Furthermore, when the fixed protective ring 402 moves between the outside of the two adjustable protective rings 401, the round rod 4063 at one end of the upper limit member 406 of the fixed protective ring 402 slides inside the limiting groove 8, and the limiting groove 8 is used to control the movement trajectory of the round rod 4063, thereby controlling the movement range of the fixed protective ring 402 outside the two medium channels A1.

[0055] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. An aluminum alloy foil for a heat exchanger, characterized in that: include: Aluminum alloy foil layer (4); Two heat-insulating panels (3) are provided, and medium channels A (1) are processed at two corners of the top and bottom of one side, and medium channels B (2) are processed at two corners of the top and bottom of the other side; A plurality of heat exchange plates A (5); and A plurality of heat exchange plates B (6) are provided, and are staggered with the plurality of heat exchange plates A (5) and are arranged in a state of being arranged opposite to each other on the left and right sides; The aluminum alloy foil layer (4) comprises two adjustment protection rings (401), a fixed protection ring (402) is arranged between the outer sides of the two adjustment protection rings (401), a same heat-insulating aluminum foil ring B (405) is arranged between the inner sides of the two adjustment protection rings (401) and the one fixed protection ring (402), and an adjustment layer (404) is arranged on the outer surface of the heat-insulating aluminum foil ring B (405); The two heat-insulating panels (3) are symmetrically arranged front and back, and a plurality of heat-exchanging plates A (5) and a plurality of heat-exchanging plates B (6) in a staggered combination are stacked and packaged therebetween, and the plurality of heat-exchanging plates A (5) and the plurality of heat-exchanging plates B (6) are connected and fixed by welding, and the heat-insulating aluminum foil ring B (405) is sleeved on the outside of the plurality of heat-exchanging plates A (5) and the plurality of heat-exchanging plates B (6), and the inner surface is in contact with the peripheral edge surfaces of the plurality of heat-exchanging plates A (5) and the plurality of heat-exchanging plates B (6).

2. The aluminum alloy foil for heat exchanger according to claim 1, characterized in that: One side of the two adjustment protection rings (401) is fixed to the two insulation panels (3) respectively by bolts, and the support and fixed protection ring (402) moves between the outer sides of the two adjustment protection rings (401) to adapt to the application number of multiple heat exchange plates A (5) and multiple heat exchange plates B (6).

3. The aluminum alloy foil for heat exchanger according to claim 1, characterized in that: The adjustment layer (404) is internally processed with a plurality of prism grooves (10), and the cross-sections of the plurality of prism grooves (10) are all regular hexagons, and the openings face perpendicular to the surface of the heat-insulating aluminum foil ring B (405).

4. The aluminum alloy foil for heat exchanger according to claim 1, characterized in that: The center of the outer side of the heat-insulating aluminum foil ring B (405) protrudes toward between the two adjustment protection rings (401), fills between the two adjustment protection rings (401), and is fitted and fixed to the inner surface of the fixed protection ring (402).

5. The aluminum alloy foil for heat exchanger according to claim 1, characterized in that: The outer surfaces of both sides of the adjustment layer (404) are provided with heat-insulating aluminum foil rings A (403), and the outer surface of the heat-insulating aluminum foil ring A (403) is in contact with the inner surface of the adjustment protection ring (401).

6. The aluminum alloy foil for heat exchanger according to claim 1, characterized in that: A limiting ring groove (7) is processed on the outer surface of one side of the adjustable protective ring (401); the limiting ring groove (7) is located on the opposite side of the connection point between the adjustable protective ring (401) and the heat insulation panel (3); the inner surface of the fixed protective ring (402) is in contact with the inner wall of the limiting ring groove (7), so that the adjustable protective ring (401) limits the movable range of the fixed protective ring (402) between the two adjustable protective rings (401) through the two limiting ring grooves (7).

7. The aluminum alloy foil for heat exchanger according to claim 6, characterized in that: A positioning ring groove (9) is machined on the inner wall of the bottom of one side of the limiting ring groove (7), and a sealing ring (407) is connected to the inside of the positioning ring groove (9); The sealing ring (407) is located on a side of the adjusting protection ring (401) away from the connection point with the heat insulation panel (3), and the fixed protection ring (402) is movably connected to the outer side of the sealing ring (407).

8. The aluminum alloy foil for heat exchanger according to claim 7, characterized in that: The sealing ring (407) is made of a silicone material and is hollow inside. The sealing ring (407) is filled between the fixed protective ring (402) and the adjustable protective ring (401). When installed, a small hole is punched on the surface of the sealing ring (407) to support the sealing ring (407) to absorb and release air inside.

9. The aluminum alloy foil for heat exchanger according to claim 6, characterized in that: The inner walls on both sides of the limiting ring groove (7) are processed with limiting strip grooves (8), and the interior of the front and rear sides of the fixed protective ring (402) are both provided with limiting members (406); One end of the limiting member (406) passes through the interior of the fixed protection ring (402) and extends into the interior of the limiting strip groove (8), thereby limiting the disconnection of the adjusting protection ring (401) and the fixed protection ring (402).

10. The aluminum alloy foil for heat exchanger according to claim 9, characterized in that: The limiting member (406) comprises a threaded rod (4061), one end of the threaded rod (4061) is integrally formed with a bolt head (4062), and the other end of the threaded rod (4061) is integrally formed with a round rod (4063); The threaded rod (4061) is threadedly connected to the inside of the fixed protective ring (402), so that one side surface of the bolt head (4062) is pressed against the outer surface of the fixed protective ring (402), and one end of the round rod (4063) extends into the inside of the limiting strip groove (8) and slides therein.

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